The saga of building an Analog Modular Synthesizer pretty much from scratch...

Friday, August 6, 2010

Chooning

I have never really got into getting the 1V/Octave tuning exact before and so I have decided to get a bit more serious about it all! This is the first experimental cut with the MIDI board (on the left) driving the X-4046 VCO (on the right). I then have a Ruby script that steps the MIDI interface and then queries the Digital Frequency Counter for the current frequency. I then do some maths and work out the slope for what would be a 1V/Oct and tweek to suit. A sweep takes about 3 or 4 minutes so the turn around is pretty good. I have also done an overnight run without a Tempco and plan to do another with to see the difference!